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for some reason or another, my AUTO_INCREMENT command won't work in my sql table for the column named 'ID'. i have no idea why. it SHOULD work, but it doesn't. anyway, that's not really much of an issue. however, i have decided to take this opportunity to learn something new with PHP (i'm a noob). i was wondering how to use the MAX() command in my sql query.
i'm building a part of a CMS where the admin will be able to insert, retrieve, and update values from sql tables in my database. each time there is a row of values inserted, i'd like to retrieve the value of the largest number in the 'ID' column, and increment it, THEN insert that value AND the rest of the values that the admin wants to place in the table. i'm pretty sure i've got the logic of the idea correct, but i'm not exactly sure how to properly execute the code. here's what i have so far.Code: Select all
<?php
$sql = "SELECT incID FROM my_reg_table MAX(incID)";
$inc_regTable = mysql_query($sql);
$reg = "SELECT * FROM my_reg_table";
$result = mysql_query($reg);
$num_rows = mysql_fetch_array($result);
if($num_rows < 1){$incID = 0;}
else{$incID = $inc_regTable++;}
$reg_table = "INSERT INTO my_reg_table (incID, uID, category, item, qty_req, still_needs) ".
"VALUES('$incID', '$uID', NULL, NULL, NULL)";
mysql_query($reg_table);
?>a couple of questions... if i'm using the MAX() function within a sql query, does the column type have to be INT? can it be VARCHAR? why or why not? second, in order to properly retrieve the MAX value of the column 'ID' do i have to use mysql_fetch_array()?? thanks in advanced for all help.
feyd | Please use
Code: Select all
,Code: Select all
and [syntax="..."] tags where appropriate when posting code. Your post has been edited to reflect how we'd like it posted. Please read: [url=http://forums.devnetwork.net/viewtopic.php?t=21171]Posting Code in the Forums[/url] to learn how to do it too.[/color]